Updates, bugfixes, a few code reorganization and inline comments.
- NEW: GetShape(), GetTile(), Remove() and Exists() are new methods to manipulate Map Layers.
- NEW: DefaultCache is a new property to set default cache path elsewhere from User's Home.
- NEW: GetItem is a new method to manipulate shape itens inside a Shape Layer.
- NEW: GetCenter made static in MapPoint.
- NEW: LineStyle is a new property to Shape Layer's Itens
- NEW: Added some inline Help comments on several methods and properties.
- BUG: Circles can now be moved by changing it's Center property.
- BUG: Circles can now have Fill colors other than Shape's default.
- BUG: Item's icon is now centralized, if other than default.
- BUG: Item's icon can now be colorized, if other than default.
- BUG: Better Layer opacity handling.
- BUG: Better ZoomOut handling.
- OPT: Use of FAST in MapPoint class and Geo module.